Surfacing machine



jan, i3, 1925.

J. A. CAMPBELL SURFACING MACHINE vFiled Jan. 5, 1924 IHIIIIIIII PatentedJan. 13, 1925.

maar@ .'roiiN A. CAMPBELL, or Quincy, MAssAciiUsnrrs sunrAciNe MACHINEApplication illed January 3, 1924. Serial No. 684,225.

To all lwhom, it may concern:

Be it known that I, JOHN A. CAMPBELL, a citizen of the United States,residing at Quincy, in the county of Norfolk and Gommonwealth ofMassachusetts, have invented new and useful Improvements in SurfacingMachines, of which the following is a specification.

This invention relates to a machine used chiefly for dressing thesurfaces of walls, ceilings, etc., composed of terrazzo, or likecomposition, whic is formed while plastic, and has a rough surface whensolidified, the machine being adapted to remove the roughness and leavesmooth surfaces.

One `object of the invention is to provide a simple and effectivemachineV which includes a wheeled carrier, movable'n a horizontalsupport, as a Hoor, and sup orting a motor, a frame which carries the saft of an abrading tool, and is movable universally, so that the actingfacev of the tool may be ressed horizontally against a vertical wall:upwardly against a ceiling, and obliquely against an inclined surface,and torque-transmitting. connections between the motor and the toolshaft, having suicient flexibility to permit thereqliired movements ofthe frame and the tool.

Another object is to provide means for causing the motor to su ply waterto the acting face of the tool, w ile the latter is in operation.

The invention is embodied in the improvements hereinafter described andclaimed.

Of the accompanying drawings forming a part of this specicatiom- Figure1 is a side elevation of a surfac ingmachine embodyin the invention, aportion.. of the casing eing broken away, and the abrading tool, itsshaft, and a portion of the frame being shown in section, the abradingtool being shown in the position it occupies when bearing on a floor.

Figure 2 is a section on line 2-2 of Figure 1, and an elevation of theparts at the left of said line.

Figure 3 is a section on line 3*-3 of Figure 1.

Figures 4, 5 and 6 are fragmentary side elevations showing the toolv indifferent operative positions.

The same reference characters indicate the same parts in all of thefigures.

The motor 12 which drives the abrading standards 19, fixed to the top vmovable, and are adapted .connected with the casing and adapted to turnfreely by ball bearings 18, interposed between said yokes and bearinsurfaces on the bottom of the casing. T e motor 12, which is preferablyelectric, is supported by of the casing. Journaled in bearings 20 on thecasing 14, is a horizontal driving-shaft 21, which is connected by gears22 and 23 with the motor shaft 24.

The abrading tool 13 has an abrasive acting face 13,

which may be of any desired form. Said tool is fixed to one end of atool-carrying shaft 25. 26 represents an elbow-sha e frame, including anouter bearing for the tool shaft 25, and an inner bearing 28, at anangle with the outer bearing 27, each of said bearings being preferablycomposed of two spaced apart sections, as shown by Figure 1, and meansrigidly connecting said bearings so that the frame is movable as a unit.

Journaled in the inner bearing 28 is a transmission shaft 29, connectedby bevel gears 30 and 31 with the tool shaft.

Flexible torque-transmitting connections are provided between thedriving shaft 2l and the transmission shaft 29, the construction andarrangement being suoli that the housing 26, and the tool 13, areuniversally to occupy various positions with relation to the carrier, asshown by Figures 1, 4, 5, and 6.

When the machine is not in use, the abradiiig tool may rest on thefloor, as shown by Figure 1, and while the machine may be operated forfloor surfacing, universal movability of the tool is not particularlydesirable in a machina intended solely for surfacing floors.

The frame may` be inverted from the position shown by igure l, so thatthe tool faces upwardly, and may act on a ceiling, as shown by Figure 4.The frame ma be held with the axis of the tool horizonte so that thetool may act on a vertical surface, as shown by Figure 5. The frame mayalso beheld with the axis of the tool inclined, so that the tool may acton an inclined surface, as shown by Figure 6. It is obvious that theaxis of the tool may assume variou tliei` operative positions, orinclinations, and that the acting face of the tool may he modified toact on curved instead of flat surfaces.

Said flexible connections'are embodied in an intermediate shaft 33, anduniversal joints 34 and 35, shown by Figure 1, connecting the ends ofthe intermediate shaft with the driving shaft and the transmissionshaft. Said joints are preferably of the type known as gimbal or Hookejoints, and as this type of joint is Well known, a description thereofis not necessary.

To supply water to the acting face of the tool 13, I provide the meansnext described. The acting face 13 is annular and surrounds a space 36,and the tool shaft 25 is tubular, and communicates with said space.

The lower portion of the casing 14 constitutes a tank, adapted to hold abody 37 of water. In the tank is a pump which, as here shown, includes acasing 38, having an intake 39 (Figure 3), and an outlet 40, and a rotorcomposed of a hub 41, and blades or buckets 42. A shaft 43, to which thehub is fixed, is journaled in bearings at opposite sides of the pumpcasing, and has a sprocket wheel 44, connected by a chain 45 with asprocket wheel 46, on the driving shaft 21.

47 represents a fixed conduit section, communicating with the pumpcasing outlet 40, and with a liexible conduit section 48, one end ofwhich is connected by a clamp 48 with a nipple on the frame 26, saidnipple communicating with the bore of the tubular tool shaft 25. Therotation of the pump rotor forces Water from the pump` casing throughthe conduit sections 47 and 48, the water being discharged into thecenter of the tool 13. The flexible section 48 may be made in twolengths, connected by a union 481, the parts of which are connected topermit one art to turn on the other, the union constituting a swivelconnection, preventing constricting twisting of the flexible section. 49represents a hood detachably secured to the carrier, and formed to coverthe casing 14, the motor, and the connections between the motor shaftand the driving shaft, and between the driving shaft and the pump shaft43. Said casmg supports the motorcontrolling switch 50, and has anaperture 51, through which -the fixed conduit section 47 passes. Thecarrier may be moved about by a handle 52, attached to the hood.

The frame 26, and the parts connected therewith, are partiallycounterbalanced by a weight 53, connected by a cord or chain 54 with theframe 26 through a casing member 55, the cord 54 passing `over a pulley56, journaled in a swiveled holder 56'", wh1ch is supported by` abracket 56b on the hood 49. The weight 53 exerts a pull on the frame andthe connected parts, sufficient to enable the operator to easily movethe tool 13 about Ion the surface on which it acts; The casing member55, and other casing members 57, 58, 59 and 60, const1tute a protectivecasing enclosing the joints 34 and 35 andthe shaft 33, said casingbeing'of the flexible construction shown by Figure '1.

I claim:

1. A surfacing machine comprising, in combination, a wheeled carrier; ladriving shaft journaled in the carrier; a motor on the. carrier; drivingconnections between the motor and the driving shaft; a movable frameincluding an outer bearing, an inner bearing at an angle with the outerbearing, and means rigidly connecting said bearings; a tool shaftJournaled 1n the `outer bearing and carrying an abrading tool; a

- transmission shaft journaled in the inner bearing and geared to thetool shaft; and liexible torque-transmitting vconnections between thedriving shaft and the transmission shaft, including an intermediateshaft and universal joints connecting the ends of the intermediate shaftwith the driving shaft and with the transmission shaft, the' arrangementbeing such that said frame is universally movable so that the actingface of the tool may be applied to either a downwardly or an upwardlyfacing horizontal surface, a vertical surface, or an inclined surface.-

2. A surfacing machine comprising, in combination, a Wheeled carrier; adriving shaft journaled in the carrier; a motor on the carrier; drivingconnections between the motor and the driving shaft; a movable frameincluding an outer bearing, an inner bearing at an angle with the outer.bearing, and means rigidly connecting said bearings; a tool shaftJournale'd in the outer bearing and carrying an abrading tool; atransmission shaft journaled in the inner bearing and geared to the toolshaft; flexible torquetransmitting connections between the driving shaftand the transmission shaft, including van intermediate shaft anduniversal joints connecting the ends of the intermediate shaft with thedriving shaft and with the transmission shaft, the arrangement beingsuch that said frame is universally movable so that the acting-face ofthe tool may be applied to leither a downwardly or an upwardly facinghorizont/al surface, a Avertical surface, or an inclined surface, andmeans counterbalancing the frame and the parts carried thereby, andincluding a swivelled holder supported by the carrier, a pulleysupported bv the holder, a cord connected at one end with the frame andpassing over the pulley and a weight attached to the opposite end of thecord.

3. A surfacing machine comprising, in combination, a`wheeled carrierhaving a tank; a pump within the tank includin a casing having an intakean'd an outlet, an a rotor, in the casing; a driving shaft journaled inthe carrier; a motor on the carrier; driving connections between themotor, the driving shaft and the pump'rotor; a movable frame includingan outer bearing, an inner bearing at an angle with the outer bearing,and means rigidl connectin said bearings; a tubular tool shaft journa edin the outer bearing and carrying an abrading tool communicating withthe bore of said shaft; a transmission shaft journaled in the innerbearing and geared to the tool shaft; flexible torque-transmittin ytween the driving shaft an the transmission connections beshaft,permitting universal movements of the frame and the parts carriedthereby; and a liquid conduit including a section fixed to the carrierand communicating with 'the pump outlet, and a flexible sectionextending from the fixed section to the bore of the tool carrying shaft,to supply liquid to the acting face of the tool when the latter is Ainany position to which it is movable. In testimony whereof I have aixedmy signature.

J OHN A. CAMPBELL.

